The answer to 'how to fix electrical panel' is to first turn off the main circuit breaker to the panel and then inspect the panel for any loose connections, burnt wires, or tripped breakers. Tighten any loose connections, replace any damaged wires, and reset any tripped breakers. If the issue persists, you may need to call a licensed electrician to diagnose and repair the problem.
Fixing an electrical panel is a potentially dangerous task that should only be attempted by experienced DIYers or professionals. It's important to take proper safety precautions, such as turning off the main power, using insulated tools, and working slowly and carefully to avoid the risk of electrical shock or fire.